I never understood why people spine wack their knives. When would you ever do that? When using the knife PROPERLY you would be applying force against the blade edge which would never disengage the lock. Always cut AWAY from you. (Shouldn't have to say that but people say it because obviously people cut towards themselves) ALSO, the knives have a lifetime warranty, it stays with the knives regardless of how many owners it had. When you spine wack a brand new knife out of the box with an EARLY lock up then yeah, it has the potential to fold on you. You haven't broken in the knife yet. There are countless threads here that discuss it. Every warranty claim is a case by case basis. If the knife is several years old with lots of normal wear and tear then yes $15 is what we charge for shipping, processing the knife, and insurance. Unfortunately we don't dictate postage fees. If the knife was not centered then I would try and talk to the previous owner. It's possible he dissembled it and reassembled it incorrectly. Maybe he made some adjustments. You're the second owner and you want to blame an off centered blade on us? Break in your knives. That's what they need to perform at their best. The whole spine wack thing is ridiculous to me. You can spine wack most knives and they'll all fail. They're NOT prying tools. They're knives. They cut what needs cutting.